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' 05 May 1997 AGE-NC Project No 95-0112 Page 9 of 14 ' 45 WELL SURVEY A list of municipal wells within Lodi was obtained from the City of Lodi Public Works Department ' The location of these wells was then plotted relative to the subject property The locations of all municipal wells within 2,000 feet of the site were plotted Municipal well No 01 was located approximately 350 feet east of the site This well was abandoned prior to June 1992 Well No 03 is located approximately 1,500 feet west of the site, and is listed as "Off Line" Well No 04 is located approximately 2,000 feet north of the site and is also listed as ' "Off Line" No other municipal wells are listed within 2,000 feet of the subject property The nearest down-gradient municipal well is No 06R, located approximately 3,500 feet south of the site in ' Blakely Park ' 5 0 MASS CALCULATIONS AND MODELING 5 1 PETROLEUM HYDROCARBONS IMPACTED SOIL 1 The estimated mass of petroleum hydrocarbons in soil beneath the former UST location was calculated from data collected prior to and after remediation Cross section A-A' was plotted from ' near MW-5, southwest of the fonner UST location, to near MW-4, toward the northeast (Figure 2) A generalized strabgraphic cross section was constructed using data from all borings advanced near the cross-sectional line Analytical results from soil samples collected prior to remediation were used ' to estimate the mass of hydrocarbons in soil before initiation of vapor extraction at the site (Figure 3) Analytical results of soil samples collected after remediation was initiated were used to estimate the mass of hydrocarbons remaining in soil at the site (Figure 4) 1 The plume was divided into sections based on analytical results of soil samples The soil volume and ' average TPH-g concentration for each section were then estimated A soil density of l 83 grams per cubic centimeter or 1399 kilograins per cubic yard of soil was used in calculations (see section 3 3 3 ) The total mass of hydrocarbons was calculated by adding the calculated mass from each section ' 5 1 1 PRE-REMEDIATION Prior to remediation, high concentrations of petroleum hydrocarbons were detected in soil samples ' collected from the full vertical extent of borings MWA and RW-1, located near the former UST location Low hydrocarbon concentrations were detected in samples collected from depths of 40 to 50 feet bsg in borings SWA and SW-2 Hydrocarbons were not detected in samples collected from